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Poster: xtifr Date: Jan 21, 2006 8:47am
Forum: etree Subject: Re: SHN, FLAC integrity...

> If so, is there a way to confirm that this did not happen?

Nobody seemed to answer this part: the answer is, yes, usually, especially with MP3, which is an old, and, frankly, terrible format. MP3 simply strips off all frequencies over a certain value, which causes a very distinctive kind of distortion to certain instruments, most notably cymbals. You can, with a little ear training, learn to recognize the effects of MP3 compression on music with cymbals at all but the very highest bit rates, and spectral analysis will easily reveal the effects of MP3 compression on any music in any case.

With other, newer, better forms of lossy compression (such as Ogg), it's much harder to detect, but someone who is experienced with spectral analysis can usually tell. For more details, you should probably check out some audiophile sites. I'm not an expert, but I have browsed such sites in the past.

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Poster: Administrator, Curator, or StaffDiana Hamilton Date: Jan 21, 2006 10:18pm
Forum: etree Subject: Re: SHN, FLAC integrity...

Flac'ing a file from ogg source (as well as mp3) would also give a smaller-than-usual filesize of the flac, right? I was suggesting that as a rule-of-thumb, at-a-glance method to confirm, apart from a more technical spectral study.

This post was modified by Diana Hamilton on 2006-01-22 06:18:29

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Poster: jeffyjo Date: Jan 22, 2006 1:44am
Forum: etree Subject: Re: SHN, FLAC integrity...

If you flac mp3s, yes. But if you get mp3s, expand them to wav, and then flac THAT... then you'll still have huge files with a lossy source.

:)

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Poster: Administrator, Curator, or StaffDiana Hamilton Date: Jan 22, 2006 2:25am
Forum: etree Subject: Re: SHN, FLAC integrity...

Shoot, that would make it hard to discern then! But wouldn't the flacs still be smaller than normal because of the presumably easy-to-compress "silent" freqs in the wav that were lost during mp3? Guess I'll have to test it sometime.

This post was modified by Diana Hamilton on 2006-01-22 10:25:16

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Poster: Administrator, Curator, or StaffBrad Leblanc Date: Jan 21, 2006 9:55pm
Forum: etree Subject: Re: SHN, FLAC integrity...

Or, ask them to send you the MD5 before the trade - that way you can compare it to what's in db.etree.org or here. If they go MP3 > WAV > FLAC it won't match.